Activating Schedule

I have been trying to find the activate schedule button for quite some time now and have read wiki and the beginners blog here but I cannot figure out once I have a schedule set with everything checked green how to actually activate the schedule.  Any help is appreciated.

Operations > fleet management > choose the calendar on the right side of the aircraft you want

Under the weekly plan for the aircraft you should see a drop down marked as select flight plan operation. Make your selection and then press execute